We really loved our stay at Claire's.
It was a little difficult to get a taxi to drop us at the door as it's a one way street and we struggled to communicate the way he needed to drive down it but it wasn't a very long walk from where he got up to.
Claire's flat is everything we wanted, it's homely and clean and has decent amenities. Everything works well and we loved hanging out in the pool and terrace onzen. If you want the onzen to be hot you need to give reception 3 hours notice (we figured this out after meeting some residents in the communal pool). We didn't use the gym or sauna/steam room but they looked good! Wifi is great.
I really like Sukhumvit so I'm pleased we chose to stay here!
Claire was a great host. I didn't meet her but she was fast to respond to my queries and very helpful.